This is a genuine Husqvarna replacement part, it is sold individually.
The Fuel Filter is inside of the fuel tank.
Its purpose is to filter out dirt and other debris from contaminating the carburetor.
It will at sometime become clogged and restrict the fuel getting to the carburetor, and will have to be replaced.
This part replaces obsolete part #: 5034434-01, 505315148, 502168101, 531004737, 503443201, 531002414, 5310024-14, 5310047-37, 5034432-01, 501877601, 501877602 and 501822301